of brooklyn



Patented ulune 29, i926..

EFE@ S'l .JOHN WAI-IL AND OTTO MELZER, GF BOOKLYN, NEW' YORK, ASSGNORS TG-A.

SCHRAEDERS SON, INC., OF BROOKLYN,

YORK.

NEW YORK, A. CORFORATION OF NEVI GAUGE.

application inea nay 5, 1924. sei-iai No. 724,359.

This invention relates to pressure gauges and aims to provide certain improvements therein. y

The invention is particularly directedfto pressure gauges of the telescopingindicating sleeve type, wherein the indicatorsleeve .which has calibrated pressure markings thereon is movedy outwardly into indicating position by a plungeriattached tothe outer endof a loadingl spring, the inner end of which is connectedwith the casing. The `plunger `is normally in contact with ythe top of an eXtensible sleeve which is moved outwardly by vfluid pressure upon its admission to the gauge,v and the loading spring; is so proportioned with relation to the extensible sleeve that 4it expands substantially uniformly therewith. fn testing gauges of this' type after assembling, it is frequently found that the indicating member isV pro- `iected outwardly, either a greater or lesser distance than the calibrated scale markings warrant for a given pressure, andv to remm edy this, a different extensible sleeve must be substituted for the one inthe gauge. This necessitates the removal o-f the gauge foot port-ion land other elements, all of which consumes considerable time.

According'- to the present invention, we provide means whereby the gauge afterassembling may be adjusted from the exterior 'thereof without the substitution of parts. 517e accomplish this through the medium of adjusting means, which are preferably screw-threaded, whereby the normal relative positions of the plunger and the top of the. indicating sleeve may bev varied and then locked in the adjusted position. Another feature of the present invention resides in providing a pressure gauge wherein the interior mechanism of the gauge or gauge insides comprising the pressure responsive means, the press-on seat and tire valvedepresser may be first assembled and then introduced into the gauge housing as a unit, thus greatly facilitating the assembling of. the gauges. The invention also includes other features of improvementwhich will be hereinafter more fully described.

Referring to the drawings wherein we have shown certain preferred embodiments of my invention, n

Figure l is a longitudinal section of a embodying the present invention;

P is` an elevation of the pressure iig. a

gauge interior mechanism or insides of the gauge shown in Figure l;

Figs. 3 and -f showviews partly in elevation and partly in longitudinal section of modified forms of the invention;

Figs. 5 and 6 are top plan views of Figs. 3 and i respectively. l

Referring first to Figs. l and 2, let A 1nldicate a tire pressure gauge as a whole which comprises a cylindrical casing B, a telescoping indicating sleeve C, an elastic thimble D, a loading spring E surrounding the thimble, and a foot portion F. Normally seating against, but disconnected from the outer end of the thimble D is a cup-shaped plunger G preferably formed of sheet metal, a portion thereof beingexternally threaded to receive the convolutions of the outer end of the loading spring E, the inner end of said spring being received and held by an internally threaded sleeve H which serves to anchor the spring to the casing. The bottom face of the sleeve H rests' against a metal washer l which in turn seats upon a lateral flange J formed on the elastic vthimble, and which is compressed `between the sleeve H and a plug K of the foot portion to provide a leak-tight seal between said parts. rThe outer end o f the casing B is turned or spun inwardly as shown at L to provide a guide and limiting stop shoulder for the telescoping sleeve C which has its lower end formed with a groove M in which seats a split spring ring N adapted to frictionally engage the inner wall of the casing B to hold the indicating sleeve in indicating position after the thimble D, loading spring E, and plunger G have' returned to normal position, after moving the vindicating sleeve outwardly. The parts thus far described are those common to the standard tire pressure gauge of the telescopine' sleeve type now in general use.

In this type of gauge theindicating sleeve is provided with a carefully calibrated scale, and the plunger which moves the indicating sleeve outwardly is normallyy in contact with the top of the elastic sleeve, which is moved outwardly by fluid pressure upon its admission to the gauge, and the loading spring is so proportioned with relation tothe extensible elastic sleeve that it expands substantially uniformly therewith,4 hence proper registering of pressure is dependent upon lll) the normal relative' positions ofthe plunger and the top of the indicating' sleeve. In testing gauges of this type after assembling' itk is frequently' found that the indicatingv member' isf projected outwardly either a greater or lesser distance than the calibrated scale markings warrant for a given test' pressure, due mainly to slight dillerences in the lengths of the elastic" thimbles" and also in the eiective lengths of the loading springs which giveris'e"v to slight-variations in the relative normal positions" ofV thev plunger with' respect tothe topV of'the' indicating sleeve.` To remedy this conditiona'diierent extensibleslee've is usually substit'uted'for the onein the gaugeywhichof course necessitates the disassembling of.' the interior mechanisn` of the 'gauge' or gauge insides.

According to' the present invention these slightv differences be 'compensated for atter'th'e'f gauge parts havebeen assembled,

adjusting'. means' operable from the exterior of the gauge. The adjusting means are adapted to vary the-'normal relative posit'ionsv of the plunger and top` of the indicating'sleeve, suchv initial adjustment not affecting `the subsequent extension 'of the leading spring. Y Y

In F'gure l? the adjustment is accomplished! by a screw plug K being. movedY into the casing., al greater orV lesser extent, after which adjustment the casing and plug are indented,-for example, with a center punch as' shown atOvr to prevent altering said" ad- Vjustrnemt.

In.l Fig. the vadjfustmentv between the plunger. G and. the top of the telescoping 'sleeve G is controlledby a# screw P passing` through the top of the telesooping sleeve and adapted to engage the bottom of the plunger to move the' sleeve outwardly. The 'adjustment after once made may be locked against accidental shit-ting by a lock nut Q on the screw Vl?.

Ink Fig. the adjusting. means is in the formV of a split screw-threaded sleeve R passing through the top of the indicating member and a wedging screw Sv entering the V,topof the split sleeve and adapted to lock it through a wedgingaction in any-adjusted position.

The gauges to Vwhich thefpresent invention is applicable may be of various forms, for

example,'lin Figs.i l and 3 the foot portion F-is formed' with a press-on seat T anda tirefvalve depresser U arrangedl at right angles to the longitudinal axisA of the gauge, and thereby adapt the gauge for ready applic'ation to tirevalves. on.v springwheels and heavy truckv wheels. In Fig;y 4' we have sliownthe invention applied to a gaugepr'ovided with a. standardV foot portion;

InFigs.. 1 and 2 the adjustmentof the gauge` is dependent upon. movement of the plunger through bodily movement of' the pressurev gauge insidesandto facilitate this movement the interior mechanism'V of the gauge or gauge insides are adapted to be' first assembled'and then introducedinto the gauge housingias a unit. To vrender this possible the sleeve H, washer I, and-the lower portion of the thimble D are all carriedby the plug K, which is formed on its upper face `with alre'ces's" accommodating said parts,

an external thread on the sleeve H engaging aninternal thread onthe plug serving to maintain said partsV in assembled" relation;

Having thus described the invention, let' it be assumed that the gauge isassembled' and j thatit is" subjected to a testpr'e'ssure of fifteenipounds, and it isfonnd that the indicating sleeve is moved outwardly to'v a pointindicatingi'ourteen pounds.' Thisindicatest'nat the." indicating sleeve must be raiseds With respect tothe plunger a' distance correspond'- ing to that between' the indications 14 and 15. In the' gauge'V of Figure lgthisis'y Vaecomplishedby Vsc :rewing the plugKfsli'ghtly farth'erinto the casing BL In Figs.` and 4l Y spirit thereof;

What we claim is: j

l'. A' pressure. gauge'comprising a casing, a pressure responsive member, a. pressure 1ndic'ating member movable by'but disconnected'from the pressure responsive`m'embe'r, one

oi' saidv members having a calibrated scale and means for adjusting the normal zero position of the indicating member from the exterior of' the, casingV for proper registering oit pressure after the gauge part'shave been assembled.

2. A pressure gauge comprisingv a casing, a pressure' responsive member within' the casing, a pressure indicating member telescopically mounted with.` respect to said casing and movable' by but` disconnected from the pressure responsive'memben one/of said members having a calibrated scaleyand means fer adjustingthe normal Zero position ofthe indicating memberlromthe exterior of the casing-'for proper registeringlofpressure after the gauge parts have' been assembled.

3. A pressure gauge comprising a pairof telescoping members7 one' of which has lll) lll() mounted therein pressure responsive means for moving the other member outwardly with respect to the first, the exterior of one or said members having a calibrated scale thereon adapted to cooperate with one edge of the other member to indicate pressure, and means on one of the telescoping mem bers operable from the exterior oli the said members after the gauge parts have been assembled ior adjusting the normal position or the top ot the movable member with respect to the pressure responsive means to insure proper registering of pressures.

Ll. A tire pressure gauge comprising an elongated casing, an indicting member telescoping with said casing, anchoring means und a plunger within the casing, pressure responsive means within said casing comprising a loading spring one end of which is anchored to the casing through said anchorg means and the other end connected to plunger which is adapted to move the ndicating member outwardly, and means perable from the exterior of the casing afe the gauge parts have been assembled, for

1. arjusting the normal position of the top of the indicating member with respect to the plunger to insure proper registering of nessnre.

5. A tire pressure gauge comprising an elongated casing, an indicating` mem )er tele- -f r with said casing, anchoring means a plunger within the casing, pressure responsive means within said casing comprising a loading spring one end of which is ancl'iored to the casing through said anchoring means and the other end connected to the plunger' which is adapted to move the indicating member outwardly, the anchoring means ot the loading spring being adapted to adjust the normal relative position of the plunger and the indicating member to insure proper registering of pressure.

fr tire pressure gauge comprising an elongated casing, an indicating sleeve telescoping therewith and interior mechanism or' the pressure gauge within the casing, said interior mechanism comprising a 'liuid pressure chamber, loading spring, means JIor anchoring` the spring to the casing, a presson seat and a tire valve depressor, said in 'terior mechanism of the gauge being insertahle into the casing as a unit and adapted to be held therein by the anchoring means. e

7. A tire pressure gauge comprising an seat and a tire valve depressor, said interiorV mechanism or the gauge being insertable into the casing as a unit and adapted to be held therein by the anchoring means.

8. A tire pressure gauge comprising a screw-threaded plug provided at one end with a press-on seat and tire valve depressor and at its other' end with an internally threaded recess, an elastic thimble having a liange at its lower end seating in said recess, a loading spring surrounding said thimble, a movable part to which the outer end of the spring is attached, a threaded sleeve to which the inner end ot the spring is attached, said sleeve engaging in the recess in the plug and having a flange seating against the flange on the. thimble compress ing the latter to provide a lealetight seal between the plug and thimble.

9. A tire pressure gauge comprising a housing consisting of a casing and a telescoping indicating sleeve and a pressure gauge interior mechanism, comprising a part for moving the indicating sleeve into indicating position, a pressure responsive means and a plug adjustable within the bottom ot' the casing, adjustment of the plug inn to the casing serving to set the gauge for proper registering of pressure and means for holding the plug in adjusted position within the casing.

lO. A tire pressure gauge comprising a housing consisting of a casing and a telescoping indicating sleeve and a pressure gauge interior mechanism, comprising a part 'for moving the indicating sleeve into indicating position, a pressure responsive means and a. plug adjustable within the bottom of the easing, adjustment of the plug into the casing serving to set the gauge for proper registering of pressure, the plug and casing being provided with engaging screw threads and means -for holding the plug in adjusted position within the casinO.

ln witness whereof, we have hereunto signed our names.

JOHN WAHL OTTO MELZER.

Bil 

